DXS-3326GSR Gigabit Layer 3 Switch
In router links advertisements, the Link State ID field is set to the router’s OSPF Router ID. The T - bit is set in the
advertisement’s Option field if and only if the router is able to calculate a separate set of routes for each IP Type of Service
(TOS). Router links advertisements are flooded throughout a single area only.
Field
Description
V - bit
When set, the router is an endpoint of an active virtual link that is
using the described area as a Transit area (V is for Virtual link
endpoint).
E - bit
When set, the router is an Autonomous System (AS) boundary
router (E is for External).
B - bit
When set, the router is an area border router (B is for Border).
Number of Links
The number of router links described by this advertisement. This
must be the total collection of router links to the area.
The following fields are used to describe each router link. Each router link is typed. The Type field indicates the kind of
link being described. It may be a link to a transit network, to another router or to a stub network. The values of all the other
fields describing a router link depend on the link’s Type. For example, each link has an associated 32-bit data field. For
links to stub networks this field specifies the network’s IP address mask. For other link types the Link Data specifies the
router’s associated IP interface address.
Field
Description
Type
A quick classification of the router link. One of the following:
Type Description Point-to-point connection to another router.
Connection to a transit network. Connection to a stub network.
Virtual link.
Link ID
Identifies the object that this router link connects to. Value
depends on the link’s Type. When connecting to an object that
also originates a link state advertisement (i.e. another router or
a transit network) the Link ID is equal to the neighboring
advertisement’s Link State ID. This provides the key for looking
up an advertisement in the link state database. Type Link ID
Neighboring router’s Router ID. IP address of Designated
Router. IP network/subnet number. Neighboring router’s
Router ID
Link
Data
Contents again depend on the link’s Type field. For
connections to stub networks, it specifies the network’s IP
address mask. For unnumbered point-to-point connection, it
specifies the interface’s MIB-II ifIndex value. For other link
types it specifies the router’s associated IP interface address.
This latter piece of information is needed during the routing
table build process, when calculating the IP address of the next
hop.
No. of TOS
The number of different Type of Service (TOS) metrics given
for this link, not counting the required metric for TOS 0. If no
additional TOS metrics are given, this field should be set to 0.
TOS 0 Metric
The cost of using this router link for TOS 0.
For each link, separate metrics may be specified for each Type of Service (TOS). The metric for TOS 0 must always be
included, and was discussed above. Metrics for non-zero TOS are described below. Note that the cost for non-zero TOS
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Содержание DXS-3326GSR - xStack Switch - Stackable
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